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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00670eb3e3e01ac2dd967441a17cf7ec991e64714b17c6c6e216a7ae083a3f9d' 
  AND token = 'p1+vGlaMqcHvYYzduCXpbT2TJ/GJicc4ik9sRGx6fb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}